Primary analysis of SWAO (South West Atlantic Ocean) ? Antarctica connectivity with barcode sequences.

MARIANO IGNACIO MARTINEZ; MARTIN IGNACIO BROGGER; DANIEL JANIES; PABLO ENRIQUE PENCHASZADEH

San José

Congreso; 3er Congreso Latinoamericano de Equinodermos; 2016

Universidad de Costa Rica

The species Pentactella leoninus (Semper, 1886), Cladodactyla crocea (Lesson, 1830) and Psolus patagonicus are three well knowdendrochirotids from South Western Atlantic Ocean. These species spans theArgentinian coast from Tierra del Fuego to Mar del Plata including theFalklands/Malvinas, in the Atlantic, and in the southern region of Chile, inthe Pacific. Different sequences have been obtained from cytochromeoxidase subunit I and previous publications (available on genbank).Estimates of evolutionary divergence between sequences and number of basesubstitutions per site from between sequences were conducted. These analysesshow a close relation between Cladodactylacrocea specimens from Mar del Plata (38°S) and Falklands/Malvinas with South Georgias´specimens, Heterocucumis denticulataand the two Antarctic species, Cladodactylasicinski and Staurocucumis liouvillei.In a phylogenetic analyses, the Psolidae appear as a monophyletic group. Theinformation obtained for Psolidae and Cucumariidae support the idea of a closeaffinity between South Western Atlantic Ocean and Antarctica. Besides therelation between specimens of Pentactellaleonina from Falklands/Malvinas (51°S) and Mar del Plata (38°S) it is closest than the relation between Patagonian(49°S) specimensindicating a possible different colonization of Mar del Plata and Patagonianpopulation.